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Proof step 12 from proof good-field-subset (conclusion)

⊦ st ⊆ st0 ∧ r -- sk ∈ st → (goodfieldandtype(r, sk, st0) ↔ goodfieldandtype(r, sk, st))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPFORWARD : ⊦ r -- sk ∈ st → r ∈ st])]]